Results 2 issues of Dara Kong

# Description The `exec` driver gets it's chroot directories from either the [default list](https://www.nomadproject.io/docs/drivers/exec.html) or the list specified in the [nomad client config](https://www.nomadproject.io/docs/agent/config.html#chroot_env). For additional flexibility, it would be nice...

theme/client
stage/needs-discussion

# What's Changing and Why Fix sample code in readme. Previously raised in #921 ## What else might be affected ## Tasks - [ ] Add tests - [ ]...